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/*
* requesttable.cc
* Copyright (C) 2000 by the University of Southern California
* $Id: requesttable.cc,v 1.4 2005/08/25 18:58:05 johnh Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*
* The copyright of this module includes the following
* linking-with-specific-other-licenses addition:
*
* In addition, as a special exception, the copyright holders of
* this module give you permission to combine (via static or
* dynamic linking) this module with free software programs or
* libraries that are released under the GNU LGPL and with code
* included in the standard release of ns-2 under the Apache 2.0
* license or under otherwise-compatible licenses with advertising
* requirements (or modified versions of such code, with unchanged
* license). You may copy and distribute such a system following the
* terms of the GNU GPL for this module and the licenses of the
* other code concerned, provided that you include the source code of
* that other code when and as the GNU GPL requires distribution of
* source code.
*
* Note that people who make modified versions of this module
* are not obligated to grant this special exception for their
* modified versions; it is their choice whether to do so. The GNU
* General Public License gives permission to release a modified
* version without this exception; this exception also makes it
* possible to release a modified version which carries forward this
* exception.
*
*/
//
// Other copyrights might apply to parts of this software and are so
// noted when applicable.
//
// Ported from CMU/Monarch's code, appropriate copyright applies.
/* requesttable.h
implement a table to keep track of the most current request
number we've heard from a node in terms of that node's id
*/
#include "path.h"
#include "constants.h"
#include "requesttable.h"
RequestTable::RequestTable(int s): size(s)
{
table = new Entry[size];
size = size;
ptr = 0;
}
RequestTable::~RequestTable()
{
delete[] table;
}
int
RequestTable::find(const ID& net_id, const ID& MAC_id) const
{
for (int c = 0 ; c < size ; c++)
if (table[c].net_id == net_id || table[c].MAC_id == MAC_id)
return c;
return size;
}
int
RequestTable::get(const ID& id) const
{
int existing_entry = find(id, id);
if (existing_entry >= size)
{
return 0;
}
return table[existing_entry].req_num;
}
Entry*
RequestTable::getEntry(const ID& id)
{
int existing_entry = find(id, id);
if (existing_entry >= size)
{
table[ptr].MAC_id = ::invalid_addr;
table[ptr].net_id = id;
table[ptr].req_num = 0;
table[ptr].last_arp = 0.0;
table[ptr].rt_reqs_outstanding = 0;
table[ptr].last_rt_req = -(rt_rq_period + 1.0);
existing_entry = ptr;
ptr = (ptr+1)%size;
}
return &(table[existing_entry]);
}
void
RequestTable::insert(const ID& net_id, int req_num)
{
insert(net_id,::invalid_addr,req_num);
}
void
RequestTable::insert(const ID& net_id, const ID& MAC_id, int req_num)
{
int existing_entry = find(net_id, MAC_id);
if (existing_entry < size)
{
if (table[existing_entry].MAC_id == ::invalid_addr)
table[existing_entry].MAC_id = MAC_id; // handle creations by getEntry
table[existing_entry].req_num = req_num;
return;
}
// otherwise add it in
table[ptr].MAC_id = MAC_id;
table[ptr].net_id = net_id;
table[ptr].req_num = req_num;
table[ptr].last_arp = 0.0;
table[ptr].rt_reqs_outstanding = 0;
table[ptr].last_rt_req = -(rt_rq_period + 1.0);
ptr = (ptr+1)%size;
}
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